Valve-grinding machine.



H. LEGGETT.

vALvE GRINDING MACHINE.

. APPLICATION F`ILED DEC. H. IBIS- l U TED STAS rr oFFrcE.

HERBERT LEGGETT, or KANSAS CITY, Missoum.

VALVE-GRINIDING' MACHINE.

Specication of Letters Patent.

, Patented Nov. 13, 1917.

1 Application led December 11, 1916. Serial No. 136,353.

To all whom it may concern.'

Be it known that I, Herinner LEGGETT, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful `Improvements in ValvevGrinding Machines, of which the following is a specification.

The present invention relates to valve grinders of the portable, power driven type, particularly adapted for use in grinding valves of internal combustion engines, and one object is to providea compact, simple and comparatively inexpensive device which will grind the valve into its seat with the greatest eliciency and despatch.

Other objects of the `invention will-hereinafter appear, and in order that said invention may be fully understood, reference will .now be made to the accompanying drawing,

in which LFigure 1 is a broken, side elevation, partly insection of the device in operative engagement with the valve of an internal combustion engine.

Fig. 2 is a detail, plan view of the gearing whereby motion is transmitted from the electric motor of the vdevice to the engine valve.

1 Fig. 3 is similar to Fig. 2, excepting that the oscillatory cam lever constituting a part f the gearing is removed. Y

-Fig 4 is an inverted, plan view of the parts disclosed by Fig. 2.

" Fig. 5 is a plan view of a modified form of gearing from that disclosed by Fig. 2. y

In carrying out the invention, I employ a case embodying a cylindrical shell' 1, and

caps 2 and 3 closing the ends of said shell.V

The upper cap 2 has an upwardly-extending handle 4 provided withv a central bore to accommodate the switch A and circuit wires B communicating with an electric motor 5 in the case. The youter ends of the circuit wires B, are preferably, provided with a plug (not shown) adapted to be removablyconnected to a suitable source of current.. The electric motor 5 is provided with a shaft yG adapt'ed to be driven continuously in one direction and provided with a iiXedly-mounted pinion8, having a step bearing 9 in the counterbore of a main shaft 11, journaled in an extension 12 on the lower side of the cap 3.

'The lower end of the main shaft 11 is provided with a bit 14, for engagement with the motor valve C, for-,the purpose'of grinding the same and the valve seat C. yThe upper end of the main shaft 11 is provided with a ixedly-mounted, oscillatory ,cam lever 16 driven in opposite directions by pinions 17 and 18, having wrist-pins 19 and 20, respectively, for imparting an oscillatory movement to said cam lever 16.

The gears 17 and 18 are mounted upon `stub shafts 22 and 23, respectively, projecting upwardly from a disk 25 loosely-mounted upon the main shaft 11, which has a shoulder 28 whereby it is suspended from said disk 25. Thevgear 17 intermeshes with the pinion 8 whereby it is driven and also intermeshes with the gear 18-which it drives 1n an opposite direction thereto. The gears 17 and 18 rotate upon their respective axes -which they are journaled, effect oscillating and intermittent progressive movement 1n one direction of the cam lever and hence of the valve. Assuming that the pinion 8 isy driven continuously to the right, it will be apparent that the transmission wheels will rotate around their respective axes, and that one of them because it is vlocated nearer the axis of the cam lever than the other, tends to swing said lever the greater distance. To compensate for this, the rotatable support,

at a point in the swinging' movement of the cam lever, under the pressure applidby i wheel 17, will oflcr less resistance' to rotation than is ofered by the cam lever and consequently will rotate in the same direction as the pinion fontil the actuatingtransmission wheel passes out of engagement with the lever and the other transmission wheel engages the lever and reverses the swing movefloating support advances intermittently or step bypstep, making one step for earl. complete oscillation or back and forth move- 'ment of the lever, theadvance of th" {ioatment thereof. It will thus be seen that the ingI Weight and the eonseqnent pianeti movement of the transmission wheels arcano the pinion 8, effecting corresponding ad van'ce or progressive movement of the cani lever and tool-carrying shaft and hence in4 surinn` that each oscillatory noveinentot 'the valve shall begin at a diiilerent point, and thus guard against scoring of the valve and valve lt will be understood that the intermittent progressive movements ci the tool-carrying;1 shaft -will vary in extent according to tlie'resistance encountered, and 'that the reaction incident to tlie'advanee movement or stroke of the cani lever as well as the reverse movement thereof, is yieldingly resisted by the rotative support, which thus acts not onl.v as a rneinbeifor shifting the transmission wheel centers and thereby rotatably adjusting they valve upon its seat for each oscillation thereof, but also acts as a shock absorber and consequently eliininates all danger oi injury to the operative parts ot the device` and it will be apparent 'that the reactions incident to both strolres of the cani lever are absorbed more readily because th'e ineru'a or` the disk and Wheel will be separately overcome.

For certain eonstrilietive r asons, l'. prefer the double actuating gearing l? and i8 as shoivn in Fig. 2, but substantially the same results may be accomplished by the internal cani shown in the modified inria, Fig. 5.

said modilied form, the construction and one 'ation of the parts are similar to that in the preferred form, except that by ernploying; an internal cani lever 16a one ivristf lpin 20"', is all that is required to oscillate said Cain lever. By making the slot 1Gb slightly at an angle to the-longitudinal anis of Ythe earn lever 16, wrist-pin 20' remains in contact longer with the side 16 of the slot than with the side 16e. In this connection, it will be noted that the pressure of the pin fagainst the outer end of the lever finds less resistance to movement by the support than is oii'ered by the lever itself and hence the support turns in the saine direction as the pinion and advances 'the gear center. The advance movement, which is repeated upon each Corresponding operation of the wrist pin, is but slight before the continued rotation of the `gear wheel places the preponderating pressure on the cam lever and imparts reverse oscillation to the sanie and to the shaft. As the remainder of the elements bear similar numerals with exponents to the eorrespondingr parts ofthe preferred form, further description ot' the moditied forni is deemed unnecessary.

Having thus described my invcnt`ion,`\vhat claim and desire to secure by Letters ent, is:

l. ,in a valve grinning machine, a drive gear. a v ilve-aetnat1ngr shaft, laterallyT en z tendinfx lever fixed to said shaft a suniort c5 A 1 .i

mounted for free oscillation aboet said shaft, ano means carried by the support and driven by said gear to oscillate the lever and through reaction oscillate said support.

2. ln. a valve grindingmachine, a drive gear, a valveaetuating shaft, a laterally extendine` lever xed to said shaft, a support mounted for free oscillation about said shaft, means carried by the support and driven by said gear to oscillate the lever through reaction oscillate said support, and a Weight member having play'connection with said support.

3, in a valve grinding machine, atool-aetuating shaft, means for rotating continuously in one direction, a oating support forming a journal for said rotating means, and means acting through the rotation of said first-named ineansto oscillate the shaft and reacting to the resistance of the latter to oscillate the said Heating support.

4f. in a valve grinding machine, a toelactnating shaft, means for rotating continir ously in one direction, a Seating support fitting around said shaiit and forming a journal for said rotating means, and means acting through the rotation of said firstnained ineens to oscillate the shaft and reacting ander the resistance or" the latter to oseillate the said shaft.

o. ln a valve grinning machine, a drive pinion, a moi-actuating shaft, means driven continuously in one direction by said drive pinion, a loating; support forming a journal for said driven means, and ineans act ing through the rotation of said driven means to oscillate the shaft and reacting nnder resistance of the latter to oscillate the said floating support. i

6. ln a valve grinding machine, a tool-actuating shaft, means for rotating continuously in one direction, a Heating support forming a journal for said rotating means, means acting through the rotation of said iirst-narned means to oscillate the shaft and reacting to the resistance out the latter to oseillate the said oating support, and a Weight Inovablelwith said support and having a play connection therewith.

7. l'n a valve grinding machine, a gear pinion, a shaft, a lever projecting laterally vtroni said shaft and provided with a cam slot, a Wheel intergeared with said pinion,- a pin projecting from said Wheel into said cam slot, and a device forming a journal support for said wheel and mounted for 0seillatory action to periodically shift the position of said Wheel about the drive pinion Without disengaging1 it from the latter.

En a valve grinding machine, a casing, valve-operating shaftv journaled in and projecting from -the casing, a drive shaft vi'thin the casing and alined with the firstiioating support about said named shaft, a gear Wheel driven continuously in one direction by said drive shaft, a the position of the latter Without disengaglever projecting laterally from said valveing it from said drive shaft. 10 operating shaft, a pin-and-slot connection In testimony whereof I-afx my signature between said gear Wheel and lever Wher'eby in the presence of two Witnesses.

a rotation of the former effects oscillation of HERBERT LEGGETT. p the latter, and a support mounted to turn Witnesses: v freely in both directions and forming a F. G. FISCHER, f journal support for said gear Wheel to shiftV L. J FISCHER. 

